Elevator.



Patented Dec. 4, |900.

J. BUSH. ELEVAI'UH.

(Applicgtion led Apr. 11, 1900.)

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J. BusH.

ELEvATo.

`Application led Apr. `11, 1900.)

(No Model.)

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lllwirnn @raras Partnr @prima JOHN BUSH, OF LONDON, ENGLAND, ASSGNOR OF ONE-HALF TO ARTHUR l DAVID JENKINS, OF BOROUGH, ENGLAND.

ELEVATOR.

SPECIFICATION forming part of Letters Patent No. 662,913, dated December 4, 1900.

Application led April ll, 1900. Serial No. 12,463. (No model.)

To all whom, it may concern:

Be it known that I, JOHN BUSH, engineer, a subject of the Queen ot Great Britain, residing at Lausanne road, Nunhead, London, in the county of Surrey, England, have invented a certain new and useful Elevator, v

of which the following is a specification.

According to this invention an electric apparatus is provided operated by the doors opening from the elevator-shaftinto the building in such manner that the usual startingrope or other part controlling the movement of the cage is firmly gripped as long as the door remains open, so that the cage cannot be moved away from the doorway until the ldoor is properly closed and bolted.

Figure 1 is an elevation, partly in section, looking outward from the elevatorshaft. Figs. 2 and 3 are side and end elevations of the gripping device on a larger scale. Fig. 4 shows the details of the bolt. Fig. 5 is an under side view of the switch connected with the elevator-door. This figure is on an enlarged scale and shows the door in both full lines and dotted lines, indicating different positions thereof. Fig. 6 is a diagram illustrating the arrangement of circuits in an elevator-shaft where a plurality of doors are employed. Fig. 7 is a detail View of part of the gripping mechanism. Fig. 8 isa view, partly7 in plan and partly in section, of the switch forming part of the devices for controlling the circuits of the gripping mechanism.

1 is the rope or bar by which the cage is started and stopped.

2 is a three-sided box or frame through which the rope passes, and 3 indicates grippin g-j aws pivoted to it. These jaws are Xed to shafts 4and are provided with teeth 5, gearing with each other, so that the jaws turn together.

6 indicates cams xed to the shafts 4.

7 indicates rollers acting on the cams and pivoted to a fork at the end of the rod 8.

When the parts are in the position shown, the rope or bar is gripped by being forced by the jaws 3 against the back of the boX 2.

9 is a soft-iron core fixed to the rod 8, and 10 11 are electromagnets in which the core Works, so forming a double solenoid.

12 13 are the spring-contacts of a switch 14, and 15 is an arm pivoted at 1G, working between them.

17 is a lug on the arm 15, and 1S 19 are pins on the rod S, engaging with it.

20 is a tumbler pivoted to the arm 15, and 21 is a spring-bolt engaging with it and coinpelling the arni to always remain in one or the other of its extreme positions in engagement with the contact-jaws 12 or 13.

22 is one of the doors opening outward from the elevator-shaft, and 23 is a springbolt carried by it.

24 is a switch in all respects similar to the switch 14 above described, but placed hori- 65 zontally instead of vertically, and 25 is a lug on its arm corresponding to the lug 17 of the other switch. The bolt 23 engages with the lug 25 when the door opens and shuts, throwing over the switch-arm from one contact to 7o the other. v

26 is a bolt (shownin Fig. 4) engaging with the door, and 27 is an arm against which the cage acts in passing. In 1 is indicated a cam-rail 100 for operating the arm 27. Vhen 75 the cage is ata landing, the cam 100, engaging the"arm 27, elevates the bolt and holds it up as long as the cage is at the landing. After the cage leaves the landing the bolt falls by gravity to the position shown in Fig. 4. Nor- 8o mally the weight of the bolt holds it down, as shown, and the ring of non-conducting material 28, carried by the bolt, breaks the circuit between the contacts 29 and 30; but when the bolt is raised the circuit is closed 85 through it.

31 is a source of electricity, which may be the same or separate from that which works the elevator. Normally the circuits through both the electromagnets 10 and 11 are 9o broken, one. atV the switch 14 and the other at the switch 24; but the opening or shutting of the door momentarily closes the circuit through the one which at that time does not contain the core 9, so attracting it, and thus moving the rod longitudinally and gripping or releasing the rope or bar 1, as the case may be, and at the sarne time'shifts the switcharm 15, again breaking the circuit.

The circuit through the electromagnet 10 roo 13, arm 15, and wire 40 back to 31.

(when closed) is as follows: from the battery or other source 31 by the wire 32 to the terminal 33, (which is connected to the arm of the switch 24,) terminal 34, wire 36, terminal 37, wire 38, magnet 10, Wire 39, contact When the door is open, as shown, this circuit is broken at the switch 14, for the arm 15 is not in engagement with the contact 13.

The circuit through the electromagnet 11 (when closed) is as follows: battery 31, wire 32, terminal 33, terminal 35, wire 41, terminal 42, bolt 26, terminal 43, wire 44, terminal 45, magnet 11, wire 46, contact 12, arm 15, and wire 40 back to 3l.

When the door is open, as shown, the arm of the switch 24 connects the terminals 33 and 34, there being no connection between 33 and 35, and the circuit through the magnet 11 is broken at the switch-24. The act of shutting the door shifts the switch 24 and connects the terminals 33 and 35, thus closing the circuit through the magnet 11, causing it to attract the core 9 and release the starting rope or bar 1 and simultaneously shift the switch-arm 15 and again break the circuit. In a similar way opening the door closes a circuit through the magnet 10, which causes the rope or bar 1 to be gripped and breaks the circuit.

As before stated, the switch 24 is similar in construction to the switch 14; but the switch 24 is arranged horizontally over the door, the lug 25 projecting downwardly and being in the path of the bolt 23. The lug 25 projects from the switch-arm d, which is pivoted to the base-plate of the switch at d. The switcharm carries a tumbler similar in construction and operation to the tumbler 20 of the switch 14, and the spring-bolt f is similar in construction and operation to the spring-bolt 21 of the switch 14. `The switch-arm d is adapted to engage alternately with the spring coutact devices c and Z2.

Fig. 5, While showing an under side View of the switch 24, also shows the door 22 by unbroken lines and by broken lines. When the door is moved in the direction indicated by the arrow, the bolt 23, engaging the lug 25, causes the switch-arm d to be moved from the position shown by full lines to the position shown by dotted lines. After the switcharm has been moved from the contact d into engagement with the contact Z) the bolt 23 springs past the lug 25 in the manner indicated, and it is then in position to again engage the lug and move the switch-arm d back into engagement with the contact d when the door is movedin an opposite direction.

The bolt 26 performs two offices. It secures the door when the door is closed and it breaks the circuit through the magnet 11 at proper times. It will be understood that there is a bolt 26 at each landing, and there is a switch 24 at each landing, with appropriate circuit connections, such as illustrated in Fig.

6. If the circuit through the magnet 11 were not normally broken at some other point than at either the switch 14 or the switch 24, then an oscillatory motion would be given to the core 9 by reason of .the circuits through the magnets 10 and 11 being untimely closed if any door were opened while the others were closed. This is made clear bythe diagram in Fig 6, where two doors are illustrated, with appropriate circuit connections. This diagram assumes that the cage is between landings, and both bolts 26 are shown as depressed, so as to break the circuit connections at these points. Of course only one gripping mechanism need be .employed for all the doors. Both doors in the diagram are shown closed by unbroken lines, and the gripping mechanism is shown in position to leave the rope or bar 1 free. It will be seen that there is no circuit through either of the magnets when the connections are as shown in full lines in Fig. 6, the cage being between the landings. Suppose, now, that the cage arrives at the lower landing. rThe first thing that occurs is that the bolt 26 is raised, establishing electrical connection between the contacts 29 and 30, and when the door is opened the switch-arm d of thelower switch 24 is moved over from contact 35 to contact 34. Then the circuit runs from battery 31, through wire 32, switch-arm d, contact 34, wire 36, binding-post 37,wire 38, magnet 10,contact 13, switch-arm 15, and wire 40, to battery. This causes the core 9 to be drawn into the magnet 10 and the brake is applied, and at the same time the switch-arm 15 is transferred from contact 13 to contact12, and the circuit is therefore broken at 13. There is at this time, of course, no circuit through the lower bolt 26, because lthe switch-arm d is not on the contact 35. If there were a permanent connection through the bolt 26 at the upper fioor, then there would at this time be a circuit through the upper bolt 26, inasmuch as the switch-arm d of the upper switch is on the contact 35. If this were the case, as soon as the switch-arm 15 was transferred to the contact 12 there would be a circuit through 'the magnet 11 and the core 9 would be moved into the magnet 11 and the brake would be released. This would again shift the switcharm 15 and the circuit would again be made through the magnet 10. Thus a reciprocating motion would be given to the brake mechanism which would destroy the efficiency of the apparatus; but by employing the bolts 26 of the construction shown and arranging that the circuit is made through one bolt at a time and only through that bolt located at the landing where the cage is situated this reciprocating or oscillating motion is prevented. The manner. in which the circuits run for other conditions can be readily traced, bearing in mind that each time that the core 9 moves the switch-arm 15 is moved and that all the bolts 26, except that located at the IIO landing where the cage is situated, are in such position as to break the electrical connection between the contacts 29 and 30.

What I Claim is.u

l. The combination of a part controlling the movement ol the cage, devices for holding this part against movement, mechanism for putting the devices into and out of action, two electric circuits controlling said mechanism one in one direction and the other in the other, a door, and two double-acting switches in the circuits one operated by said mechanism and the o1 her by the door, the arrangement being such that both circuits are normally broken but one or other is momentarily closed when the door is opened or shut.

2. The combination of a part controlling the movement of the cage, devices for holding this part against movement, mechanism for putting the devices into and out of action, two electric circuits controlling said mechanism one in one direction and the other in the other, a door, a bolt engaging with the door and forming part of one of the circuits breaking it when shut and closing it when withdrawn and two double-acting switches in the circuits one operated by the mechanism and the other by the door, the arrangement being such that both circuits are normally7 broken but oneis momentarily closed when the door is opened and the other is momentarily closed when the door is shut and bolted.

3. The combination of a part controlling the movement of the cage, devices for holding this part against movement, a rod whose movement puts the devices into and ont of action, a core on the rod, two electromagnets in which the core works, electric circuits through the magnets, a door, and two doubleacting switches in. the circuits one operated by the rod and the other by the door, the arrangement being such that both circuits are normally broken, but one or other is momentarily closed when the door is opened or shut.

it. The combination of a part controlling the movement of the cage, devices for holding this part against movement, a rod whose movement puts the devices into and out of action, a core on the rod, two electromagnets in which the core works, electric circuits through the magnets, a door, a bolt engaging with the door and forming part of one of the circuits closing it when withdrawn and breaking it when shut and two double-acting switches in the circuits one operated by the rod and the other by the door, the arrangement being such that both circuits are norY mally broken but one is momentarily closed when the door is opened and the other is momentarily closed when the door is shut and bolted.

5. The combination of a rope or bar controlling the movement of the cage, pivoted gripping-jaws engaging with the rope or bar, cams connected to the jaws, rollers acting on the cams, a rod carryingthe rollers, a core on the rod, two electromagnets in which the core works, electric circuits through the magnets, a door, and two double-acting switches in the circuits one operated .by the rod and the other by the door, the arrangement being such that both circuits are normally broken but one or other is momentarily closed when the door is opened or shut.

6. The combination of a rope or bar con-v trolling the movement of the cage, pivoted gri pping-j aws engaging with the rope or bar, cams connected to the jaws, rollers acting on the cams, a rod carrying the rollers, a core on the rod, two electromagnets in which the core works, electric circuits through the magnets, a door, a bolt engaging with the door and forming part of one of the circuits breaking it when shut and closing it when withdrawn and two double-acting switches in the circuits one operated by the rod and the other by the door, the arrangement being such that both circuits are normally broken but one is momentarily closed when the door is opened and the other is momentarily closed when the door is shut and bolted.

JOHN BUSH.

Vitnesses:

ARTHUR D. JENKINS, THOMAS L. JENKINS. 

